杂多酸引发四氢呋喃开环聚合反应 Ⅳ.以环氧丙烷为促进剂  

TETRAHYDR OF URAN POLYMERIZATIION INITIA TED WITH HETEROPOLYACIDⅣ. PROPYLEN E OXIDE AS PROMOTER

作　　者：陈宇[1] 张阿方[1] 张广利[1] 张鸿志[1] 

机构地区：[1]北京大学化学与分子工程学院,北京100871

出　　处：《高分子学报》1999年第5期644-648,共5页Acta Polymerica Sinica

基　　金：高等学校博士学科点专项科研基金

摘　　要：The polymerization of tetrahydrofuran ( T H F) initiated by heteropolyacid H3 P W12 O40( P W12) in low concentration could be effectively promoted by propylene oxide( P O) . The polymerization conversion reached 50 % ～60 % after a reaction time around 5 h . Wateror butylene glycol was used to controlthe molecular weightofthe productin the rangeof 1000 ～3000 . The polymerization started upon addition of P Oand stopped with completeconsumption of P O,but it would start again when a new portion of P O was added . Theaverage hydroxyl end group functionality of polyether glycol is close to 2 . The ratio ofprimary and secondary hydroxyl end groups is close to one ,and the percentage of thehydroxyl group attached to P O moietiesatthe polymerchain endsis higherthan 50 % ofthetotal hydroxyl end groups. All the obtained results inferred that T H F polymerizationpromoted by P Oproceeded quite similar to that promoted by ethylene oxide,i.e., P O wasnecessary in theinitiation of T H Fpolymerization to startthe propagation ofchains,and withthe complete consumption of P Othe propagating chains transformed into dormant species,which can be re initiated by the addition ofa supplementary portion of P O.The polymerization of tetrahydrofuran ( T H F) initiated by heteropolyacid H3 P W12 O40( P W12) in low concentration could be effectively promoted by propylene oxide( P O) . The polymerization conversion reached 50 % ～60 % after a reaction time around 5 h . Wateror butylene glycol was used to controlthe molecular weightofthe productin the rangeof 1000 ～3000 . The polymerization started upon addition of P Oand stopped with completeconsumption of P O,but it would start again when a new portion of P O was added . Theaverage hydroxyl end group functionality of polyether glycol is close to 2 . The ratio ofprimary and secondary hydroxyl end groups is close to one ,and the percentage of thehydroxyl group attached to P O moietiesatthe polymerchain endsis higherthan 50 % ofthetotal hydroxyl end groups. All the obtained results inferred that T H F polymerizationpromoted by P Oproceeded quite similar to that promoted by ethylene oxide,i.e., P O wasnecessary in theinitiation of T H Fpolymerization to startthe propagation ofchains,and withthe complete consumption of P Othe propagating chains transformed into dormant species,which can be re initiated by the addition ofa supplementary portion of P O.

关 键 词：聚醚二醇 杂多酸 四氢呋喃 环氧丙烷 促进剂 

分 类 号：O633.5[理学—高分子化学]